TY - CONF A1 - Nonn, Aida A1 - Wessel, Waldemar A1 - Schmidt, Tanja T1 - Application of finite element analysis for assessment of fracture behavior of modern high toughness seamless pipeline steels T2 - 23rd International Society of Offshore and Polar Engineering 2013 (ISOPE 2013), Anchorage, USA N2 - Fracture behavior of seamless pipeline material X65Q acc. to API 5L has been studied both experimentally and numerically at different loading conditions (quasi-static vs. dynamic) and temperatures. The recent findings have shown difficulties in applying well established methods for determination of transition behavior or prediction of ductile crack arrest for the new generation of high-toughness steels. The irregular fracture performance (e.g. so-called "abnormal inverse fracture" appearance, significant scattering in ductile-to-brittle-transition-temperature region, etc.) suggests that the influence of pipe dimensions, loading parameters, crack initiation resistance as well as testing procedure on the fracture behavior has been neither understood nor properly described. This work aims to shed light on these questions regarding the applicability of conventional methods and to better illuminate most relevant parameters affecting fracture behavior of high toughness steels. To achieve this goal, experimental data basis for analysis of fracture behavior in transition and upper shelf regime has been established by conducting quasi-static fracture mechanics tests and dynamic tests on Battelle Drop Weight Tear (BDWT or DWT) specimens at different temperatures. The evaluation of obtained test results in upper shelf has been additionally complemented by numerical simulation of damage behavior. The results highlight the influence of stress conditions on fracture behavior with reference to pipe dimensions and loading conditions and, subsequently, may be used as a basis for revision of existing design methods. KW - Rissfortschritt KW - Nahtloses Rohr KW - Pipeline KW - Bruchmechanische Prüfung KW - Finite-Elemente-Methode Y1 - 2013 UR - https://opus4.kobv.de/opus4-oth-regensburg/frontdoor/index/index/docId/1494 ER -